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Debugging SENT Automotive Buses with an Oscilloscope

Debugging SENT Automotive Buses with an Oscilloscope Application Note, thumbnail image

The SENT bus is used in automotive sensors to transmit high-resolution measurements to electronic control units (ECUs), usually in the powertrain. Decoding the Single Edge Nibble Transmissions (SENT) by looking at the signals can be very difficult, especially due to the pulse-width encoding scheme used in the standard.  An oscilloscope equipped with SENT protocol decoding and triggering can be an invaluable tool. This application note:

  • Gives a brief orientation on the physical layer and packet structures of SENT, with a goal of providing just enough detail to help with troubleshooting
  • Explains how to set up decoding on an oscilloscope equipped with SENT decoding
  • Explains how to interpret fast and slow channel packet data on an oscilloscope equipped with SENT decoding
  • Explains what triggering and searching options are available on an oscilloscope equipped with SENT serial triggering and analysis